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A. K.M.M.H. Meaze,Guinyun Kim,Dongchul Son,Hengsik Kang,Hossain Ahmed,In Soo Ko,Jong Hwa Chang,Kun Joong Yoo,Moo-Hyun Cho,Tae-Ik Ro,Won Namkung,Won-Chung Chung,Young Seok Lee,Young-Ae Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
W. measure. tota. neutro. cross-section. o. natura. hafniu. i. th. neutro. energ. regio. fro. 0.. e. t. 10. e. b. usin. th. neutro. time-of- igh. metho. a. th. Pohan. Neutro. Facility. whic. consist. o. a. electro. linac. . water-coole. T. targe. wit. . wate. moderator. an. a. 11-m-lon.time-of- igh. path. . 6Li-ZnS(Ag. scintillato. wit. . diamete. o. 12.. c. an. . thicknes. o. 1..c. wa. use. a. . neutro. detector. an. . natura. hafniu. meta. plate. . . . c. i. are. b. 0. m. i. thickness. wa. use. fo. th. neutro. transmissio. measurement. Th. backgroun. leve. wa. determine. b. usin. notch-lter. o. Co. In. an. C. sheets. I. orde. t. reduc. th. gamm. ray. fro. Bremsstrahlun. an. fro. neutro. capture. w. employe. . neutron-gamm. separatio. syste. base. o. thei. dieren. puls. shapes. Th. presen. measuremen. wa. compare. wit. th. previou. one. an. th. evaluate. dat. i. ENDF/B-VI. Th. resonanc. parameter. wer. extracte. fro. th. transmissio. dat. b. usin. th. compute. cod. SAMMY. whic. utilize. bot. Dopple. an. resolutio. broadenin. effect. an. Bayes. generalize. leas. square. technique.
Scanning Electron Microscopic Study of the Rat Lung induced by the Paraquat Poisoning
Kim, Moo-Kang,Hirohata, Yasuhisa,Kaoru, Aihara,Ghazizadeh, M.,Lee, Young-Ho,Shin, Tae-Kyun 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2
제초제로 널리 사용되고 있는 paraquat를 25g정도 체중의 rat 복강내로 20㎎/㎏되게 생리 식염수로 희석하여 주입한 후 시간이 경과함에 따라 폐에서 일어나는 형태학적 변화를 주사전자현미경을 이용하여 관찰한 결과 주입 후 30분부터 전반적으로 폐조직이 불규칙하게 되는 형태학적 변화가 있었으며 1시간후에는 폐포내에 적혈구가 출현하였고 시간이 경과함에 따라 폐조직의 변화가 더 심하였으며 그 주된 변화는 제1형 세포의 감소, 출혈, 섬유성 물질의 증가, 대식세포수의 증가등에 기인하는 섬유성 변화와 폐포간 중격의 증가 그리고 폐포의 폐쇄등이었다.
Sustainable wastewater treatment and recycling in membrane manufacturing
Razali, Mayamin,Kim, Jeong F.,Attfield, Martin,Budd, Peter M.,Drioli, Enrico,Lee, Young Moo,Szekely, Gyorgy The Royal Society of Chemistry 2015 GREEN CHEMISTRY Vol.17 No.12
<P>It is widely accepted that membrane technology is a green and sustainable process; however, it is not well known that the membrane fabrication process itself is quite far from green, with more than 50 billion liters of wastewater being generated every year contaminated with toxic solvents such as DMF and NMP. This urgent challenge is often overlooked and recent attempts to improve the sustainability of membrane fabrication have been limited to the replacement of toxic solvents with greener alternatives. Our recent survey from membrane industries indicates that such wastewater contributes to more than 95% of the total waste generated during the membrane fabrication process, and their disposal is considered cumbersome. Hence, recycling wastewater in the membrane industry is a pressing challenge to be resolved to augment the rapidly growing membrane market. In this work, a continuous wastewater treatment process is proposed and the quality of the recycled water was validated through membrane fabrication and performance tests. Seven different classes of adsorbents—graphene, polymers with intrinsic microporosity, imprinted polymers, zeolites, metal organic frameworks, activated carbon, and resins—were evaluated. The isotherm and kinetic behaviors of the best adsorbents have been fully characterized and the adsorbent regenerability without any performance loss has been confirmed for up to 10 wastewater treatment cycles. It has been demonstrated that over 99% of the organic impurities in the wastewater can be successfully removed and the recycled water can be reused without adverse effects on the final membrane performance. The proposed wastewater treatment technique can reduce the process mass intensity (PMI) of membrane fabrication by 99.9% per m<SUP>2</SUP> of the membrane produced. The required energy duty for different regeneration methods and wastewater treatment methods revealed that the adsorption technology is the most effective method, with the lowest energy requirement of about 1200 kJ per m<SUP>2</SUP> of the membrane produced.</P> <P>Graphic Abstract</P><P>Tackling the wastewater challenge in polymer membrane manufacturing with a continuous adsorption process. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5gc01937k'> </P>
Khang, Gilson,Rhee, John M.,Shin, Philkyung,Kim, In Young,Lee, Bong,Lee, Sang Jin,Lee, Young Moo,Lee, Hai Bang,Lee, Ilwoo The Polymer Society of Korea 2002 Macromolecular Research Vol.10 No.3
In order to endow with new bioactive functionality from small intestine submucosa (SIS) powder as natural source to poly (L-lactide) (PLA) and poly (lactide-co-glycolide) (PLGA) synthetic biodegradable polymer, porous SIS/PLA and SIS/PLGA as natural/synthetic composite scaffolds were prepared by means of the solvent casting/salt leaching methods for the possibility of the application of tissue engineered bone and cartilage. A uniform distribution of good interconnected pores from the surface to core region was observed the pore size of 40~500 ${\mu}{\textrm}{m}$ independent with SIS amount using the solvent casting/salt leaching method. Porosities, specific pore areas as well as pore size distribution also were almost same. After the fabrication of SIS/PLA hybrid scaffolds, the wetting properties was greatly enhanced resulting in more uniform cell seeding and distribution. Five groups as PGA non-woven mesh without glutaraldehyde (GA) treatment, PLA scaffold without or with GA treatment, and SIS/PLA (Code No.3 ; 1 : 12 of salt content, (0.4 : 1 of SIS content, and 144 ${\mu}{\textrm}{m}$ of median pore size) without or with GA treatment were implanted into the back of nude mouse to observe the effect of SIS on the induction of cells proliferation by hematoxylin and eosin, and von Kossa staining for 8 weeks. It was observed that the effect of SIS/PLA scaffolds with GA treatment on bone induction are stronger than PLA scaffolds, that is to say, in the order of PLA/SIS scaffolds with GA treatment > PLA/SIS scaffolds without GA treatment > PGA nonwoven > PLA scaffolds only with GA treatment = PLA scaffolds only without GA treatment for the osteoinduction activity. The possible explanations are (1) many kinds of secreted, circulating, and extracellular matrix-bound growth factors from SIS to significantly affect critical processes of tissue development and differentiation, (2) the exposure of SIS to GA resulted in significantly calcification, and (3) peri-implant fibrosis due to covalent bonding between collagen molecule by crosslinking reaction. In conclusion, it seems that SIS plays an important role for bone induction in SIS/PLA scaffolds for the application of tissue engineering area.
콜라겐 젤과 성장인자 전처치 및 피복재료가 다공성안와삽입물의 섬유혈관증식에 미치는 효과
이준영,김석영,유창국,이무석,이상렬,오중협,김성주.Joon-Young Lee. M.D.. Suk-Young Kim. Ph.D.. Chang-Kook You. Moo-Seok Lee. Sang-Yeul Lee. M.D.. Ph.D.. Jung-Hyub Oh M.D.. Ph.D.. Sung-Joo Kim M.D.. Ph.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.6
Purpose: To determine the effect of bFGF complexed collagen gel, which allows constant release of bFGF along with biodegradation of the collagen gel. The specific study purpose was to determine whether it can accelerate the fibrovascular ingrowth into wrapped HA-coated porous alumina and to verify the safety of new wrapping materials. Synthetic polyester-urethane (Neuropatch?) and lyophilized bovine pericardium (Lyoplant?) were compared to donor sclera for the fibrovascular ingrowth into HA-coated porous alumina. Methods: The experimental and control groups, each consisting of 9 rabbits were wrapped with each wrapping materials (3 rabbits per wrapping material). The experimental group underwent pretreatment of bFGF-collagen gel while the control group did not. The fibrovascular ingrowth was compared at 2 and 4 weeks after implantation. Western blot analysis was conducted at 4 weeks using antibodies against CD141 and laminin. The rate of fibrovascular ingrowth was fastest in orbital implant wrapped with Lyoplant?. Results: Histopathologic examinations at 2 weeks showed no differences in distance and percentage area of fibrovascular ingrowth. Histopathologic examinations at 4 weeks showed that pretreatment of bFGF-collagen gel increased the fibrovascular ingrowth in the experimental group. Western blot analysis on experimental group also showed that the expressions of CD141 and laminin were increased by bFGF-collagen gel, thereby indicating that the fibrovascular proliferations were accelerated by bFGF released from the complex. Conclusions: bFGF-collagen gel increased the rate and degree of fibrovascular growth into hydroxyapatite- coated porous alumina by releasing bFGF as the collagen gel biodegraded. Both Lyoplant? and Neuropatch? were evaluated as safe for substitution of the donor sclera.
반휘발성유기화합물을 위한 수동형 공기 샘플러로서 소파 내 폴리우레탄 폼의 사용 가능성 연구
김경훈,Hyeong-Moo Shin,Luann Wong,Thomas M. Young,Deborah H. Bennett 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
폴리우레탄 폼(polyurenthane foam, PUF)은 유기화합물을 위한 수동형 공기 샘플러에 흡착제로 쓰이고 있다. PUF는 실내 가구 충전재로써 쓰이고, 기존 연구를 통해 가구 속 PUF가 실내에서 반휘발성유기화합물(Semivolatile organic compounds, SVOCs)을 흡수한다는 것이 밝혀졌다. 본 연구에서는 소파 속 PUF의 SVOCs 보유능력을 평가하고, 실내 SVOCs 노출 평가를 위한 소파 PUF 내 SVOCs 농도의 대체지표물 사용 가능성을 확인하고자 하였다. 이를 위해 캘리포니아 13개 집에서 사용 중인 소파에서 PUF 샘플을 수집했다. 소파 표면으로부터 깊이 별 PUF 내 SVOCs 농도 변화를 알고자 3개의 다른 깊이에서 PUF를 샘플링했다. 동일 집에서 측정한 집 먼지 내 SVOCs 농도를 이용하여 실내 공기 내 SVOCs 농도를 추정하였고, PUF와 실내 공기 간 SVOCs 분배계수를 계산하였다. 마지막으로, PUF의 SVOCs 보유능력을 추정하였고, SVOCs가 실내 환경 미디엄(PUF/공기/카펫/벽/비닐표면)에 어떤 비율로 존재하는지 질량 분배를 추정하였다. 64개 분석대상 SVOCs 중 29종이 실내 소파 내 PUF에서 검출되었다. 이 중 5개 종의 농도는 소파 표면에서 내부 방향으로 감소했다. 화장품에 포함된 3개의 화합물과 페놀은 실내 환경미디엄에 존재하는 전체 질량 중 20% 이상의 질량이 소파 PUF에 존재하는 것을 확인했다. 본 연구를 통해, 소파 내 PUF가 다양한 SVOCs를 흡수하여 보유하고 있음을 확인했다. 또한, 소파 표면과의 피부 접촉이 화장품 함유 SVOCs 및 페놀의 노출 경로가 될 수 있음을 확인했다.